Most 'hobby grade' solenoids in most hobbies at STP have a mean life expectancy of 10,000,000 cycles.
Even discounting that by an order of magnitude, you should not see reliable chance of failure in your tank's life span at 60 cycles per day.
Using the electronic method as opposed to physical, the coils usually have 10,000 hours MTBF, and assuming the cycle time is 2 seconds (I am guessing here) then you are 120 seconds a day (2 minutes) or 12.167 hours a year. Again, statistically, not much chance of failure in your tank's life span.
Having said that, the failure curve for these items is heavily weighted to the left, so take what I said with a grain of salt. You should still have no problem at all with that duty cycle.
Charles
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Where did my rum go?!
Success in this hobby does not count how you spend your money, it counts how you spend your time.
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